is a class act.
Known best for his crude rage against Lindsay "fire crotch" Lohan
, Brandon is now attacking ex-girlfriend, Mischa Barton
After catching his ex at a Nylon
magazine party in L.A. on Wednesday, Brandon Twittered: "Omg. Just realized my ex turned into 1 of the fattest people in the planet. I'm gonna start dating plus size models. Not! Mischa the heifer."
Wow Brandon, we're ...